Electric-arc lamp



July 15 1924. 1,501,219

H. JACKSON ELECTRIC ARC LAMP Filed June 16 3 1921 5 sheets sheet l A? INVENTOR wow/{um 2 W Jul 15, 19% 1,501,219

' 1 H. JACKSON ELECTRIC ARC LAMP Filed June 16. 1921' 3 Sheets-Sheet 2 g- 5% M l;

Filed June 16. 1921 3 Sheets-Sheet 3 Q INVENTOR. M

Patented July 15, 1924.

UNITED STATES HARDY JACKSON, OF HIGHER BROUGHTON, MANCHESTER, ENGLAND.

ELECTRIC-ARC LAMP.

Application filed June 16, 1921.

To all whom it may concern:

Be it known that I, HARDY JACKSON, a British subject, residing at Higher Broughton, Manchester, England, have invented certain new and useful Improvements in ElectrioArc Lamps, of which the following is a specification.

This invention relates to improvements in electric arc lamps and more particularly to the are lamp employed in projecting lanterns.

It consists in constructing the lamp with a standard hinged and pivotally mounted on a. base and carrying two arms capable of sliding up and down thereon. These are con nected by pivoted levers with a nut mounted on a screw with a handle at one end, so that by the rotation of the screw the arms are brought nearer together as the carbons carried thereon burn away, the handle also serving as a grip for tilting the standard to alter the vertical position of the arc gap between the carbons, and for twisting the standard on. its base so as to move the arc gap to one side or the other.

It consists further in the construction of the various parts of the apparatus as will be described.

The invention will be described with reference to the accompanying drawings.

Fig. 1 is a side elevation of apparatus.

ig. 2 is a section on line x-w Fig. 1.

Fig. 3 is a plan.

Fig. 4 is a section on line k4 Fig. 1.

The apparatus is constructed with a base plate A to which is attached by means of the cover plate A, a base piece A which is hinged at Z) to a standard B, preferably circular in cross section. Two arms 0 C which carry at their outer ends the carbons c 0 are mounted on the standard B so as to be capable of sliding up and down thereon. A hole 6 is formed through the standard B to receive the end 6 (reduced in size) of a rod E. A collar 6 is affixed to the end of the rod E by a pin 6 to prevent longitudinal movement of the rod E, but at the same time allowing it to freely rotate in the hole I) in the standard B. The end of the rod E is provided with a knob or handle E by which it can be rotated and it is threaded for a. portion of its length to re ceive a nut F attached to the arm C C by the pivoted rods f. It will be seen that by the rotation of the threaded rod E by the handle E the arms G G will be caused to Serial No. 477,982.

slide on the standard B and will be brought nearer together or farther apart according to the direction of the rotation of the rod E. Furthermore, by raising or depressing the handle E the inclination of the standard B can be altered, thus altering the height of the arc gap, or by pressing the handle E sideways the base piece A will cause to revolve on its centre together with the standard B and the arms C G thus moving the arc gap toone side or the other as may be required.

The top carbon holder G is made in two parts 9 g aflixed together by bolts or screws and separated by a piece of insulating material 9 The member 9 holds the carbon 0 and the member 9 slides in the top arm C mounted on the standard B. The arm C is hollow throughout its length, in one end of which the member 9 slides, and a threaded rod H passes through it and engages a tapped hole g in the member g to operate the latter. The arm C is provided with a loose portion 9* for the member the portion 9 being held in osition by screws 0. The threaded rod ITis operated by a handle H and a long slot in the standard B to allow the rod H to pass therethrough at whatever height on the rod H the arm C may be. The rod H is held in position by grooved collar 9 in a recess in the arm C. It will thus be seen that by rotating the rod H the top carbon holder G can be moved in and out as desired for adjusting the position of the top carbon 0 relative to the lower carbon 0 to compensate for unequal burning of the carbons, and to adjust the crater.

The lower carbon holder K is made in two parts is is affixed together by bolts or screws and separated by a piece of insulating material 24 The member holds the carbon and the member is is pivotally mounted at c on the lower arm O sliding on the standard B. A projection M on the arm C is provided with a hole m in which a rod 42 is held in position by a pinned collar but free to rotate. The threaded part of the rod it engages a tapped hole in a nut 01 pivotally mounted between the two plates forming the link 0 pivoted to a projection Z0 on the member is of the carbon holder K. Thus, when the threaded rod n is rotated the holder K is moved on its pivot on lower arm C to adjust the horizontal position of the carbon C.

The current is led to the carbon holders G and K from two terminals P P arranged behind the standard B, through flexible cables jo p to metal conductors p p affixed to the holders. The rods 72 and p extend to the rear of the apparatus so that the flexible leads 2) and 2) will not be burnt by the heat of the arc.

This apparatus has considerable advantages over the usual electric arc lamps used in projecting lanterns, as it obviates the use of expensive machine out racks and pinions and worms and worm gears, which often become jammed by fragments of'carbon; the diiterent controls are more readily operated, and only three controls, one control giving three movements, are necessary instead of the usual controls, five in number; it pre vents the. danger of the leads burning through and it is quicker in action.

What I claim as my invention and desire to protect by Letters Patent is 1. An electric arc lamp applicable for use in projection lanterns comprising in its construction a central upright standard, a pivot on which it rocks, a base to which the pivot is connected, two arms slidably mounted on the upright standard, a threaded rod carried by the upright standard, a nut on said rod, toggle levers connecting the arms to the nut by which their relative positions are adjusted, a carbon holder slidably mounted on the upper arm, a pivot connect ed to the lower arm,asecond carbon holder carried by said pivot, a'pivot connected to the lower carbon holder and a threaded rod to adjust the lower carbon holder angularly in a plane at right angles to the standard.

2. An electric arc lamp applicable for use in projection lanterns comprising in its con- 7 struction a central. upright standard, a pivot on which the standard rocks, a base to which the pivot is connected, two arms slidably mounted on the upright, a threaded rod carried by the upright standard, a nut on said rod, toggle levers connecting the arms to the nut by which their relative positions are adjusted, a carbon holder slidably mounted on the upper arm, a pivot connected to the lower arm, a second carbon holder carried by said pivot, a pivot connected to the lower carbon holder, a threaded rod to adjust the lower carbon holder angularly in a plane at right angles to the standard and metal conductors aiiixed to the carbon holders extending to the rear of the apparatus so that the flexible leads connected thereto will not be burnt by the heat of the arc.

In testimony whereof I have hereunto set Y my hand in presence of two subscribing witnesses.

HARDY JACKSON.

lVitnesses J. OWDEN OBRIEN, HARRY BARNFATHER. 

